并列题名：Research on the welfare distributional effects of China's social medical insurance system Research on the welfare distributional effects of China's social medical insurance system 并列题名：Research on the distribution effect of China's fiscal and taxation system Research on the distribution effect of China's fiscal and taxation system 并列题名：Research on the optimization of rural social endowment insurance system 并列题名：Research on the construction of China's social credit supervision system Research on the distribution effects of fiscal policy in China Research on the optimization of rural social endowment insurance system 并列题名：Research on income redistribution effect of China's tax 并列题名：Studies on the reform of social medical insurance system